Enable AUXV and QPassSignals in gdb-remote for NetBSD

[krytarowski]

Summary

NetBSD is an ELF platform and it uses Elf Auxiliary Vector like Linux and other modern BSDs.

While there enable QPassSignals for the NetBSD port as well.

Sponsored by <The NetBSD Foundation>

[labath]

At one point we will need to come up with a better way to control these features.

[krytarowski]

I'm still evaluating whether to implement on the kernel side PT_SET_SIGPASS/PT_GET_SIGPASS. Some software like floating point can use it heavily.

[labath]

In D31146#706249, @krytarowski wrote:

I'm still evaluating whether to implement on the kernel side PT_SET_SIGPASS/PT_GET_SIGPASS. Some software like floating point can use it heavily.

Also there are programs which use SIGALRM or realtime signals very extensively, and those can get very much slowed down by a debugger. I think this would be a great addition, particularly as stopping a process is a much heavier operation on netbsd. I wish linux had that.

source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp

GDBRemoteCommunicationServerCommon::Handle_qSupported(
   uint32_t max_packet_size = 128 * 1024; // 128KBytes is a reasonable max packet
                                          // size--debugger can always use less
   response.Printf("PacketSize=%x", max_packet_size);
 
   response.PutCString(";QStartNoAckMode+");
   response.PutCString(";QThreadSuffixSupported+");
   response.PutCString(";QListThreadsInStopReply+");
   response.PutCString(";qEcho+");
-#if defined(__linux__)
+#if defined(__linux__) || defined(__NetBSD__)
   response.PutCString(";QPassSignals+");
   response.PutCString(";qXfer:auxv:read+");
 #endif
 
   return SendPacketNoLock(response.GetString());
 }
 
 GDBRemoteCommunication::PacketResult

source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp

   // No response here - the stop or exit will come from the resulting action.
   return PacketResult::Success;
 }
 
 GDBRemoteCommunication::PacketResult
 GDBRemoteCommunicationServerLLGS::Handle_qXfer_auxv_read(
     StringExtractorGDBRemote &packet) {
 // *BSD impls should be able to do this too.
-#if defined(__linux__)
+#if defined(__linux__) || defined(__NetBSD__)
   Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS));
 
   // Parse out the offset.
   packet.SetFilePos(strlen("qXfer:auxv:read::"));
   if (packet.GetBytesLeft() < 1)
     return SendIllFormedResponse(packet,
                                  "qXfer:auxv:read:: packet missing offset");